CN115051328A - Distribution network direct-current circuit breaker operation evaluation system and method - Google Patents
Distribution network direct-current circuit breaker operation evaluation system and method Download PDFInfo
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- CN115051328A CN115051328A CN202210763063.7A CN202210763063A CN115051328A CN 115051328 A CN115051328 A CN 115051328A CN 202210763063 A CN202210763063 A CN 202210763063A CN 115051328 A CN115051328 A CN 115051328A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The invention relates to the technical field of circuit breakers and discloses a distribution network direct current circuit breaker operation evaluation system and a distribution network direct current circuit breaker operation evaluation method.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a system and a method for evaluating operation of a distribution network direct-current circuit breaker.
Background
With the continuous adjustment and improvement of the energy strategic structure, the multi-terminal flexible direct current transmission gradually becomes an important technical means for solving new energy grid connection. The direct current circuit breaker is used as a protection element in a multi-terminal flexible direct current transmission system, and the working reliability and the stability of the direct current circuit breaker are extremely important. The operation and maintenance of the direct-current circuit breaker are used as supervision and management links of the working reliability and stability of the direct-current circuit breaker, and the importance and the great significance of the operation and maintenance of the direct-current circuit breaker are self-evident. However, with the increase of the use of the direct current circuit breakers, the fault rate of the direct current circuit breakers in daily work is also remarkably increased, time consumed for troubleshooting is shortened, labor cost is greatly increased, later maintenance cost of products is correspondingly increased, the expenditure can be reduced by evaluating the working state of the direct current circuit breakers, and the maintenance cost of the products is controlled.
Direct current breaker's complete machine and component part, including quick mechanical switch, main tributary electric power electronic valve group, control protection system and water cooling system etc. to the gentle direct current breaker for the engineering of high pressure, because its size is huge, the subassembly is numerous, and normal fortune dimension maintenance work is very difficult, this maintenance efficiency greatly reduced that will lead to direct current breaker.
Disclosure of Invention
The invention provides a distribution network direct current breaker operation evaluation system and a distribution network direct current breaker operation evaluation method, and solves the technical problem that the maintenance efficiency of a direct current breaker is low.
In view of this, the first aspect of the present invention provides a distribution network dc circuit breaker operation evaluation system, including: the device comprises an acquisition module, a processing module and an evaluation module;
the acquisition module is used for acquiring key characteristic quantities of the direct current circuit breaker and sending the key characteristic quantities to the processing module, wherein the key characteristic quantities comprise a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action time sequence and mechanical characteristic parameters;
the processing module is used for acquiring a maximum voltage floating difference value of a voltage value of the energy storage capacitor in a preset time period, acquiring a maximum current floating difference value of a discharge current value of the energy storage capacitor in the preset time period, comparing the opening and closing action time sequence of the circuit breaker with a preset opening and closing trigger action time sequence to obtain an opening and closing action time sequence difference value, and fitting a mechanical characteristic parameter time sequence curve according to the mechanical characteristic parameters;
the evaluation module is used for comparing the maximum voltage floating difference value with a preset voltage floating threshold value and judging whether the energy storage capacitor has a fault according to a comparison result; the maximum current floating difference value is compared with a preset current floating threshold value, and whether the energy storage capacitor has a fault or not is judged according to a comparison result; the switching-on and switching-off action time sequence difference value is compared with a preset action time sequence threshold value, and whether the switching-on and switching-off action fails or not is judged according to a comparison result; and the time sequence curve of the mechanical characteristic parameter is compared with a preset time sequence curve, and whether the mechanical characteristic has a fault or not is judged according to a comparison result.
Preferably, the mechanical characteristic parameters include a switch stroke, an over travel, a switching-on and switching-off speed, a switching-on and switching-off time, an insulation establishing open distance and a loop resistance of a mechanical switch of the circuit breaker.
Preferably, the system further comprises an expert database module, wherein the expert database module comprises an evaluation index database, a test history database and an expert database, the evaluation index database is used for storing evaluation index thresholds corresponding to different types of circuit breakers, and the evaluation index thresholds comprise a voltage floating threshold, a current floating threshold and an action time sequence threshold; the test history database is used for storing key characteristic quantity data which are acquired historically and correspond to circuit breakers of different models, and the expert database is used for storing time sequence curves of mechanical characteristics.
Preferably, the system further comprises a time obtaining module and a state evaluating module, wherein the time obtaining module is used for calculating the total working duration according to the working duration and the standby duration of the circuit breaker, and the state evaluating module is used for calculating the state coefficient of the circuit breaker according to the total working duration and the total leaving-factory duration.
Preferably, the system further comprises: the fault acquisition module is used for acquiring fault code information of the circuit breaker and sending the fault code information to the processing module, and the processing module is also used for matching the fault code information in a preset fault type database to obtain a corresponding fault type.
Preferably, the system further comprises: and the report generation module is used for generating a breaker operation evaluation report according to the fault judgment result output by the evaluation module.
Preferably, the system further comprises: and the early warning module is used for generating a fault early warning signal to warn when the fault judgment result output by the evaluation module is a fault.
In a second aspect, the invention further provides a distribution network dc breaker operation evaluation method, and the distribution network dc breaker operation evaluation system applied in the invention includes the following steps:
collecting key characteristic quantities of the direct current circuit breaker, wherein the key characteristic quantities comprise a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action time sequence and mechanical characteristic parameters;
acquiring a maximum voltage floating difference value of a voltage value of an energy storage capacitor in a preset time period, acquiring a maximum current floating difference value of a discharge current value of the energy storage capacitor in the preset time period, comparing the opening and closing action time sequence of the circuit breaker with a preset opening and closing trigger action time sequence to obtain an opening and closing action time sequence difference value, and fitting a mechanical characteristic parameter time sequence curve according to the mechanical characteristic parameters;
comparing the maximum voltage floating difference value with a preset voltage floating threshold value, and judging whether the energy storage capacitor has a fault according to a comparison result; comparing the maximum current floating difference value with a preset current floating threshold value, and judging whether the energy storage capacitor has a fault according to a comparison result; comparing the opening and closing action time sequence difference value with a preset action time sequence threshold value, and judging whether the opening and closing action fails according to a comparison result; and comparing the mechanical characteristic parameter time sequence curve with a preset time sequence curve, and judging whether the mechanical characteristic has a fault according to a comparison result.
According to the technical scheme, the invention has the following advantages:
according to the invention, by collecting the key characteristic quantities of the direct current circuit breaker, wherein the key characteristic quantities comprise the voltage value of the energy storage capacitor, the discharge current value of the energy storage capacitor, the opening and closing action time sequence of the circuit breaker and mechanical characteristic parameters, each key characteristic quantity is compared with the corresponding preset characteristic quantity threshold value, so that whether the circuit breaker breaks down or not is judged, and the overhauling efficiency of the direct current circuit breaker is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a distribution network dc circuit breaker operation evaluation system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for evaluating operation of a distribution network dc breaker according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For convenience of understanding, referring to fig. 1, the system for evaluating the operation of the distribution network dc circuit breaker provided by the present invention includes: the system comprises an acquisition module 100, a processing module 200 and an evaluation module 300;
the acquisition module 100 is configured to acquire key characteristic quantities of the direct current circuit breaker and send the key characteristic quantities to the processing module 200, where the key characteristic quantities include a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action timing sequence, and a mechanical characteristic parameter;
the mechanical characteristic parameters comprise the switching stroke, the over travel, the switching-on and switching-off speed, the switching-on and switching-off time, the insulation establishing distance and the loop resistance of a mechanical switch of the circuit breaker.
The sensor comprises a displacement sensor, a current sensor, a voltage sensor, a current source, a high-precision detection resistor and a power supply control interface, and parameters and measuring ranges of the sensor can be configured and replaced according to actual requirements.
The current voltage value and the loop resistance value can be directly measured by a sensor and a loop resistance meter, a displacement sensor and a 10V precision power supply are needed during mechanical characteristic test, active measurement voltage is provided for a stroke displacement sensor, displacement voltage sampling is carried out through a 12-16bit high-speed precision ADC chip, a displacement curve is stored, and the measured displacement and time of the displacement sensor need to be calculated at the opening and closing speed at a certain moment.
The processing module 200 is configured to obtain a maximum voltage floating difference value of a voltage value of the energy storage capacitor within a preset time period, obtain a maximum current floating difference value of a discharge current value of the energy storage capacitor within the preset time period, compare a circuit breaker opening and closing action timing sequence with a preset opening and closing trigger action timing sequence to obtain a opening and closing action timing sequence difference value, and fit a mechanical characteristic parameter timing sequence curve according to a mechanical characteristic parameter;
the evaluation module 300 is configured to compare the maximum voltage floating difference with a preset voltage floating threshold, and determine whether the energy storage capacitor fails according to a comparison result; the device is also used for comparing the maximum current floating difference value with a preset current floating threshold value and judging whether the energy storage capacitor has a fault according to a comparison result; the switching-on and switching-off action time sequence difference value is compared with a preset action time sequence threshold value, and whether the switching-on and switching-off action fails or not is judged according to a comparison result; and the time sequence curve of the mechanical characteristic parameter is compared with a preset time sequence curve, and whether the mechanical characteristic has a fault or not is judged according to a comparison result.
In a specific example, the maximum voltage floating difference value of the voltage values of the energy storage capacitor within the last 30 days is calculated, the maximum voltage floating difference value is compared with a preset voltage floating threshold (such as 10V) to judge the severity of the voltage deviation of the capacitor, if the difference value is greater than 10V, the energy storage capacitor is judged to have a fault, otherwise, the energy storage capacitor is judged not to have a fault; calculating the maximum current floating difference value of the discharge current value of the corresponding energy storage capacitor when the breaker acts within the last 30 days, comparing the maximum current floating difference value with a preset current floating threshold value (50A), if the maximum current floating difference value is larger than 50A, indicating that the energy storage capacitor fails, otherwise, indicating that the energy storage capacitor does not fail; the method comprises the steps of obtaining a circuit breaker opening and closing action time sequence and a trigger action time sequence issued by a trigger controller, comparing a difference value of the opening and closing action time sequences with the trigger action time sequence issued by the trigger controller, and if the time sequences are consistent, indicating that the opening and closing action is not in fault, otherwise indicating that the opening and closing action is in fault.
This embodiment provides a join in marriage net direct current breaker operation evaluation system, through the key characteristic quantity of gathering direct current breaker, the key characteristic quantity includes energy storage capacitor's voltage value, energy storage capacitor's discharge current value, circuit breaker divide-shut brake action chronogenesis and mechanical characteristic parameter, compares each key characteristic quantity with the preset characteristic quantity threshold value that corresponds to judge whether break down of circuit breaker, thereby improve direct current breaker's maintenance efficiency greatly.
In a specific embodiment, the system further comprises an expert database module, wherein the expert database module comprises an evaluation index database, a test history database and an expert database, the evaluation index database is used for storing evaluation index thresholds corresponding to different types of circuit breakers, and the evaluation index thresholds comprise a voltage floating threshold, a current floating threshold and an action time sequence threshold; the test history database is used for storing key characteristic quantity data which are acquired historically and correspond to circuit breakers of different models, and the expert database is used for storing time sequence curves of mechanical characteristics.
The system is internally provided with the database and the expert library, so that the effectiveness evaluation and the operation life evaluation of the test data can be performed, all the test processes are standardized, and practical and effective work guidance and auxiliary judgment functions can be provided for users.
In a specific embodiment, the system further includes a time obtaining module and a state evaluating module, the time obtaining module is configured to calculate a total operable time length according to the operating time length and the standby time length of the circuit breaker, and the state evaluating module is configured to calculate a state coefficient of the circuit breaker according to the total operable time length and the total factory time length.
The circuit breaker state coefficient is calculated to obtain the circuit breaker state coefficient, and the circuit breaker state coefficient is compared with a preset circuit breaker state threshold value through the coefficient, so that the state grade of the circuit breaker is determined.
In one embodiment, the system further comprises: the fault acquisition module is used for acquiring fault code information of the circuit breaker and sending the fault code information to the processing module, and the processing module is also used for matching the fault code information in a preset fault type database to obtain a corresponding fault type.
The preset fault type database comprises mapping relations between fault code information and fault types, and corresponding fault types can be matched in the fault type database according to the fault code information and output.
In one embodiment, the system further comprises: and the report generation module is used for generating a breaker operation evaluation report according to the fault judgment result output by the evaluation module.
In one embodiment, the system further comprises: and the early warning module is used for generating a fault early warning signal to warn when the fault judgment result output by the evaluation module is a fault.
The specific determination process of the key feature quantity is as follows:
1) when the direct current circuit breaker is in a shutdown state, detecting the switching stroke, the over travel, the switching speed, the switching time, the insulation establishing distance and the loop resistance of the rapid mechanical switch. Parameters such as switch travel, over travel, opening and closing speed, opening and closing time, insulation establishing opening distance and the like of the mechanical switch are calculated by a travel sensor, port measurement, time measurement and the like, an acquired data system can carry out collection processing and display the collected data on an upper computer, the parameters are processed according to a typical opening and closing curve graph in a database, and the opening and closing speed, the opening distance of a movable contact and a static contact at a certain time, whether bouncing occurs and the like are calculated. Then, standard set values of all parameters are input in the main interface, and the system can make a judgment according to whether the test data are in a set reasonable range. When the parameters are in the range of normal values, the system does not give an early warning. When the parameters are in the abnormal range, early warning of different conditions can be made according to the abnormal degree, reliability evaluation of the direct current breaker is influenced, if the tested closing speed is too low, the closing time is longer and exceeds the standard range, but the opening speed and the opening curve are normal, so that the condition that the closing time is too long can be judged, the opening cannot be influenced early in the fault, the breaking capacity cannot be influenced, a response alarm signal is output, and overhauling or continuous operation can be performed according to the actual condition. Therefore, the state evaluation of each module makes corresponding maintenance and repair suggestions for the direct current circuit breaker according to the reliability of the direct current circuit breaker.
2) When the direct current breaker is in a shutdown state, the current conversion assembly is unfastened from the main loop, the capacitance value, the inductance value and the discharge valve group driving level are independently tested by using a corresponding testing module and a sensor of the operation and maintenance detection device, and the acquired data system can be collected and processed and displayed on an upper computer. Filtering according to different signal types, screening out background interference and useless data, and then judging whether effective data is in a normal value range in a database. When the parameters are in the range of normal values, the system does not give an early warning. When the parameters are in the abnormal range, early warning of different conditions can be given according to the abnormal degree, and reliability evaluation of the direct current breaker is influenced. The direct current breaker can be correspondingly detected and maintained according to the reliability of the direct current breaker.
3) When the direct current breaker is in a shutdown state, the valve bank is unfastened from the main loop, the voltage between C, G, E of the power electronic valve bank is tested by the IGBT voltage measuring module, the output voltage of a power supply is driven, and the capacitance value of a capacitor and other inherent electrical parameters are buffered by the capacitance value measuring module. The collected data system can be collected and processed and displayed on the upper computer. And then the system filters according to the type of the data, screens out background interference and useless data, compares effective data with driving voltage in a database, and does not give an early warning when the parameters are in the range of normal values. When the parameters are in the abnormal range, early warning of different conditions can be given according to the abnormal degree, and reliability evaluation of the direct current breaker is influenced. The direct current breaker can be correspondingly detected and maintained according to the reliability of the direct current breaker.
4) And when the direct current breaker is in a shutdown state, the control optical fiber of the controller is released from the main loop to test the control sequence of the controller. The collected data system can be collected and processed and displayed on the upper computer. The main process is that the operation detection tester receives an optical signal of the controller, the original signal is analyzed according to high and low levels, the analysis result is an original communication message, each frame of the messages consists of 16-bit 0 and 1, then the system analyzes the messages according to a communication protocol preset by software, the analyzed result is protocol information sent by the other side, the protocol information comprises trigger information of a mechanical switch, an electronic valve section and a current conversion loop, the time sequence of the mechanical switch, the electronic valve section and the current conversion loop can be obtained according to the information, and the system can make a judgment according to whether the time sequence is consistent with the time sequence in a database or not. When the parameters are in the range of normal values, the system can not give early warning. When the parameters are in the abnormal range, early warning of different conditions is given according to the abnormal degree, and reliability evaluation is given to the direct current breaker. The direct current breaker can be correspondingly detected and maintained according to the reliability of the direct current breaker.
5) The timing sequence of the controller is analyzed according to the change of the analog quantity of an execution component in the switching-on and switching-off process, such as measuring the driving level, the current, the voltage signal, the voltage drop change of a power electronic device and the like, if the mechanical switch receives the switching-on and switching-off signal, the voltage on two sides of the switching-on and switching-off coil is changed from the low level to the high level, if the IEGT driving voltage signal is changed from-15V to 22V, the electronic device is judged to be switched on, if the current in the transfer loop is changed from 0 to the oscillation current with the peak value of more than ten kiloamperes, the transfer loop can be judged to be triggered, and then the timing sequence of each branch circuit is obtained according to the time difference value of the level change in each loop. And (3) obtaining a result through time domain analysis, and judging and analyzing the result and the time sequence in the database, wherein the measurement result is accurate compared with the scheme 1, and a communication protocol is not required to be disclosed.
6) When the direct current breaker is in a shutdown state, the isolation switch or the breaker is disconnected from the main loop for independent testing, because the loop resistance test has relevant standard regulations, the test is carried out according to the relevant standards of the loop resistance test, after the test is finished, the loop resistance meter is connected with the operation detection tester through a serial port data line, the test data can be transmitted to the operation detection tester, and the test data can be judged according to the loop resistance standard in the database. The functional module carries out the development prejudgment of the loop resistance according to the data of the isolation disconnecting link or the breaker of the direct current breaker and provides the maintenance or overhaul suggestion of the loop resistance of the direct current breaker.
The above is a detailed description of an embodiment of a distribution network dc breaker operation evaluation system provided by the present invention, and the following is a detailed description of an embodiment of a distribution network dc breaker operation evaluation method provided by the present invention.
For convenience of understanding, please refer to fig. 2, the invention provides a distribution network dc breaker operation evaluation method, and the distribution network dc breaker operation evaluation system applied in the invention includes the following steps:
s1, collecting key characteristic quantities of the direct current circuit breaker, wherein the key characteristic quantities comprise a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action time sequence and mechanical characteristic parameters;
s2, obtaining the maximum voltage floating difference value of the voltage value of the energy storage capacitor in a preset time period, obtaining the maximum current floating difference value of the discharge current value of the energy storage capacitor in the preset time period, comparing the opening and closing action time sequence of the circuit breaker with a preset opening and closing trigger action time sequence to obtain the opening and closing action time sequence difference value, and fitting a mechanical characteristic parameter time sequence curve according to the mechanical characteristic parameters;
s3, comparing the maximum voltage floating difference value with a preset voltage floating threshold value, and judging whether the energy storage capacitor has a fault according to the comparison result; comparing the maximum current floating difference value with a preset current floating threshold value, and judging whether the energy storage capacitor has a fault according to a comparison result; comparing the difference value of the opening and closing action time sequence with a preset action time sequence threshold, and judging whether the opening and closing action has a fault according to the comparison result; and comparing the mechanical characteristic parameter time sequence curve with a preset time sequence curve, and judging whether the mechanical characteristic has a fault according to a comparison result.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing system embodiment, and is not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A distribution network direct current breaker operation evaluation system is characterized by comprising: the device comprises an acquisition module, a processing module and an evaluation module;
the acquisition module is used for acquiring key characteristic quantities of the direct current circuit breaker and sending the key characteristic quantities to the processing module, wherein the key characteristic quantities comprise a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action time sequence and mechanical characteristic parameters;
the processing module is used for acquiring a maximum voltage floating difference value of a voltage value of the energy storage capacitor in a preset time period, acquiring a maximum current floating difference value of a discharge current value of the energy storage capacitor in the preset time period, comparing the opening and closing action time sequence of the circuit breaker with a preset opening and closing trigger action time sequence to obtain an opening and closing action time sequence difference value, and fitting a mechanical characteristic parameter time sequence curve according to the mechanical characteristic parameters;
the evaluation module is used for comparing the maximum voltage floating difference value with a preset voltage floating threshold value and judging whether the energy storage capacitor has a fault according to a comparison result; the maximum current floating difference value is compared with a preset current floating threshold value, and whether the energy storage capacitor has a fault or not is judged according to a comparison result; the switching-on and switching-off action time sequence difference value is compared with a preset action time sequence threshold value, and whether the switching-on and switching-off action fails or not is judged according to a comparison result; and the time sequence curve of the mechanical characteristic parameter is compared with a preset time sequence curve, and whether the mechanical characteristic has a fault or not is judged according to a comparison result.
2. The distribution network direct current circuit breaker operation evaluation system of claim 1, wherein the mechanical characteristic parameters include a switch stroke, an over travel, a switching speed, a switching time, an insulation set-up separation, and a loop resistance of a mechanical switch of the circuit breaker.
3. The distribution network direct current circuit breaker operation evaluation system of claim 1, further comprising an expert database module, wherein the expert database module comprises an evaluation index database, a test history database and an expert database, the evaluation index database is used for storing evaluation index thresholds corresponding to different types of circuit breakers, and the evaluation index thresholds comprise a voltage floating threshold, a current floating threshold and an action timing sequence threshold; the test history database is used for storing key characteristic quantity data which are acquired historically and correspond to circuit breakers of different models, and the expert database is used for storing time sequence curves of mechanical characteristics.
4. The distribution network direct current circuit breaker operation evaluation system of claim 1, further comprising a time acquisition module and a state evaluation module, wherein the time acquisition module is configured to calculate a total operable time length according to an operating time length and a standby time length of the circuit breaker, and the state evaluation module is configured to calculate a circuit breaker state coefficient according to the total operable time length and a total factory time length.
5. The distribution network dc circuit breaker operation evaluation system of claim 1, further comprising: the fault acquisition module is used for acquiring fault code information of the circuit breaker and sending the fault code information to the processing module, and the processing module is also used for matching the fault code information in a preset fault type database to obtain a corresponding fault type.
6. The distribution network dc circuit breaker operation evaluation system of claim 1, further comprising: and the report generation module is used for generating a breaker operation evaluation report according to the fault judgment result output by the evaluation module.
7. The distribution network dc circuit breaker operation evaluation system of claim 1, further comprising: and the early warning module is used for generating a fault early warning signal to warn when the fault judgment result output by the evaluation module is a fault.
8. A distribution network direct current breaker operation evaluation method is applied to the distribution network direct current breaker operation evaluation system in claim 1, and is characterized by comprising the following steps:
collecting key characteristic quantities of the direct current circuit breaker, wherein the key characteristic quantities comprise a voltage value of an energy storage capacitor, a discharge current value of the energy storage capacitor, a circuit breaker opening and closing action time sequence and mechanical characteristic parameters;
acquiring a maximum voltage floating difference value of a voltage value of an energy storage capacitor in a preset time period, acquiring a maximum current floating difference value of a discharge current value of the energy storage capacitor in the preset time period, comparing a switching-on and switching-off action time sequence of the circuit breaker with a preset switching-on and switching-off trigger action time sequence to obtain a switching-on and switching-off action time sequence difference value, and fitting a mechanical characteristic parameter time sequence curve according to the mechanical characteristic parameters;
comparing the maximum voltage floating difference value with a preset voltage floating threshold value, and judging whether the energy storage capacitor has a fault according to a comparison result; comparing the maximum current floating difference value with a preset current floating threshold value, and judging whether the energy storage capacitor has a fault according to a comparison result; comparing the opening and closing action time sequence difference value with a preset action time sequence threshold value, and judging whether the opening and closing action has a fault according to a comparison result; and comparing the mechanical characteristic parameter time sequence curve with a preset time sequence curve, and judging whether the mechanical characteristic has a fault according to a comparison result.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542146A (en) * | 2022-11-30 | 2022-12-30 | 南方电网调峰调频发电有限公司 | Method, device, equipment and medium for synchronously testing outlet switch device of generator set |
| CN116660703A (en) * | 2023-08-01 | 2023-08-29 | 安徽斯派迪电气技术有限公司 | Distribution network system insulation fault on-line monitoring system based on data analysis |
-
2022
- 2022-06-30 CN CN202210763063.7A patent/CN115051328A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542146A (en) * | 2022-11-30 | 2022-12-30 | 南方电网调峰调频发电有限公司 | Method, device, equipment and medium for synchronously testing outlet switch device of generator set |
| CN115542146B (en) * | 2022-11-30 | 2023-03-24 | 南方电网调峰调频发电有限公司 | Method, device, equipment and medium for synchronously testing outlet switch device of generator set |
| CN116660703A (en) * | 2023-08-01 | 2023-08-29 | 安徽斯派迪电气技术有限公司 | Distribution network system insulation fault on-line monitoring system based on data analysis |
| CN116660703B (en) * | 2023-08-01 | 2023-11-10 | 安徽斯派迪电气技术有限公司 | Distribution network system insulation fault on-line monitoring system based on data analysis |
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